Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A microscopic model is used to discuss the long-range ordering behaviour of the oxygen vacancies in mullite. This aluminosilicate of composition Al 2 (Al 2+2x Si 2-2x )O 10-x (vacancy) x presents an extremely stable incommensurate modulated structure with a wave vector Q Ic (x) which depends on the composition index x…
alpha-Ketoglutarate dehydrogenase was inactivated irreversibly and completely during oxidation of alpha-ketoadipic acid. The inactivation was revealed both in the model system with ferricyanide and in the overall reaction catalyzed by the alpha-ketoglutarate dehydrogenase complex. Neither substrate depletion nor produ…
A program has been initiated under the sponsorship of the Department of Energy (DOE), Office of Industrial Technology, to improve the performance of stationary gas turbines in cogeneration through the selective replacement of metallic hot section parts with uncooled ceramic components. It is envisioned that the succes…
The partial crystallization and melting of the Se sublattice in the superionic conductor Ag2Se are investigated by means of a constant-pressure and constant-temperature molecular dynamics simulation. The effective interionic potential of Rino et al. (1988) is used. The transition temperature is estimated to be about 1…
We explain the counterintuitive result that increased short-range order reduces the conductivity in ${\mathrm{Ni}}_{0.8}$${\mathrm{Mo}}_{0.2}$ and suggest an explanation for the ``K-state'' effect, in which severe deformation can significantly increase conductivity.
The stability of the luminescence from porous Si has been improved by rapid thermal oxidation. As-prepared and oxidized samples have been compared by cathodoluminescence and photoluminescence. Electron beam excitation resulted in rapid decay of the porous Si emission from as-prepared samples. Photoluminescence measure…
The fabrication technology and the properties of a light-emitting device including a porous pn junction are presented. We employ the selective formation of different kinds of porous silicon substructures caused by the doping level and the illumination during anodization. The device has a nanoporous light-emitting n la…
On the basis of the anionic group theory, a new nonlinear optical crystal cesium triborate, (CsB3O5, CBO) was discovered. Single crystals of CBO in centimeter size were grown from a stoichiometric melt. The transparent range of CBO covers from 170 to 3000 nm. The preliminary measurement of its second harmonic generati…
Abstract Thin polymeric films were deposited from siloxane plasma on the surface of polyethylene. The surface composition of the films was measured by X‐ray photoelectron spectroscopy (XPS) and the permeability to O 2 by an analytic gas permeability fractometer. No significant improvement of barrier to O 2 was observe…
Presents the fundamental science needed to understand the classification of materials and the limits of their properties in terms of temperature, strength, ductility, corrosion and physical behaviour, while emphasizing materials processing, selection and property measurement methods.
Can one protein sequence encode two structures? Oxidative folding of human insulin-like growth factor 1 (IGF-1), a globular protein of 70 residues, is shown to yield two products of similar thermodynamic stability. This observation is of particular interest in light of the recent demonstration that two of the three di…
Angle-resolved photoemission spectroscopy has been employed to study in situ intercalation of the layered compound ${\mathrm{VSe}}_{2}$ with Cs. The results show that the valence band structure of ${\mathrm{VSe}}_{2}$, which initially is of 3D character, is transformed to become essentially 2D upon Cs intercalation. T…
We have made a detailed pressure--magnetic-field--temperature phase diagram study of the organic conductors (TMTSF${)}_{2}$${\mathrm{PF}}_{6}$ and (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$ in the low temperature regions dominated by the cascade of field-induced spin density wave (FISDW) transitions. The ${\mathrm{PF}}_{6}$…
We present a theory of stripe domain structures in a thin ferromagnetic film with easy-axis magnetic anisotropy and long-range dipole interactions, for a wide range of temperatures below the reorientational phase transition. Spatial anisotropy generated by the exchange energy within domain walls pins the orientation o…
Two dilute alloys with nominal compositions Cu—1.2%Fe2Ti and Cu—0.8%FeTi are studied in the temperature range 500 to 950 °C by electrical conductivity measurements and by transmission electron microscopy (TEM) and field ion microscopy (FIM). Under equilibrium conditions, the two alloys are located in the fields (“Cu”…
The statistical distribution function for dislocation link lengths in a unit volume of plastically deformed crystalline materials as proposed by Wang et al. is used to derive the relationship between the average dislocation link length, 〈γ〉, and the dislocation density, Q. It is shown that 〈γ〉 = βϱ−½: β = (2/πc)½ wher…
The Co82−xFexZr18 (0≤x≤16) alloys melt-spun with vs=40-47 m/s exhibit a single phase for all x. The Curie temperature Tc and the room-temperature saturation magnetization σs increase monotonically with increasing Fe concentration x. The anisotropy field for x=0 is found to be about 3.13T. In the as-quenched samples at…
Epstein-frame loss measurements were performed on 3.2% Si-Fe nonoriented strips cut along and transverse to the rolling direction, in the frequency range 10–100 Hz and at various peak inductions between 0.3 and 1.6 T. The behavior of hysteresis loss Ph and excess loss Pe vs peak induction B and frequency f was worked…
Sm2Fe17Nx is of considerable current interest as a permanent-magnet material because of its enhanced Curie temperature and uniaxial anisotropy. The electronic structures of Sm2Fe17Nx for x=0 and x∼2.6 have been studied with photoemission and spin-polarized calculations. The materials are prepared by arc melting and ni…
Abstract It is shown how a characterization of unfilled, amorphous rubber networks can be evaluated from uniaxial stress‐strain measurement data. Beside the cross‐linking density, the relative scission probability during the curing procedure is evaluated, which determines the amount of dangling free chain ends and the…